Planet and spaceship creation, travel and destruction

systems.py

@@ -0,0 +1,64 @@
+from pyglet.shapes import Circle
+
+from libs.ecs import World
+from components import (
+    PlanetMarker,
+    Position,
+    Color,
+    Radius,
+    SpaceShipMarker,
+    Target,
+    Vector2D,
+)
+from settings import SPACESHIP_COLOR, SPACESHIP_RADIUS, SPACESHIP_SPEED
+
+
+class PlanetRenderSyncSystem:
+    @classmethod
+    def process(cls, world: World, **args):
+        for _, component_storage in world.query(PlanetMarker):
+            pos: Position = component_storage[Position]
+            color: Color = component_storage[Color]
+            radius: Radius = component_storage[Radius]
+            circle: Circle = component_storage[Circle]
+            circle.radius = radius.value
+            circle.x, circle.y = pos.x, pos.y
+            circle.color = color.value
+
+
+class SpaceShipRenderSyncSystem:
+    @classmethod
+    def process(cls, world: World, **args):
+        for _, component_storage in world.query(SpaceShipMarker):
+            pos: Position = component_storage[Position]
+            circle: Circle = component_storage[Circle]
+            circle.radius = SPACESHIP_RADIUS
+            circle.x, circle.y = pos.x, pos.y
+            circle.color = SPACESHIP_COLOR
+
+
+class SpaceShipKillSystem:
+    @classmethod
+    def process(cls, world: World, **args):
+        marked_for_death = []
+        for entity, component_storage in world.query(SpaceShipMarker):
+            pos: Position = component_storage[Position]
+            target: Target = component_storage[Target]
+            approach_radius = component_storage[Radius]
+            if abs(pos - target) < approach_radius.value:
+                marked_for_death.append(entity)
+        for entity in marked_for_death:
+            world.get_components(entity=entity, pop=True)
+
+
+class SpaceShipTravelSystem:
+    @classmethod
+    def process(cls, world: World, **args):
+        for _, component_storage in world.query(SpaceShipMarker):
+            pos: Position = component_storage[Position]
+            target: Target = component_storage[Target]
+
+            diff: Vector2D = target - pos
+            diff_mag = abs(diff)
+            pos.x = pos.x + args["dt"] * SPACESHIP_SPEED * diff.x / diff_mag
+            pos.y = pos.y + args["dt"] * SPACESHIP_SPEED * diff.y / diff_mag